Thermodynamics of an attractive 2D Fermi gas

TL;DR

This paper experimentally investigates the thermodynamic properties of an attractive 2D Fermi gas, revealing unique features in its equations of state that differ from 3D systems, especially during the classical to quantum crossover.

Contribution

It provides the first detailed experimental determination of the compressibility, density, and pressure equations of state for an attractive 2D Fermi gas across various temperatures and interaction strengths.

Findings

Density equation of state peaks at intermediate densities

Distinct thermodynamic behavior compared to 3D gases

Evidence of classical to quantum crossover in 2D

Abstract

Thermodynamic properties of matter are conveniently expressed as functional relations between variables known as equations of state. Here we experimentally determine the compressibility, density and pressure equations of state for an attractive 2D Fermi gas in the normal phase as a function of temperature and interaction strength. In 2D, interacting gases exhibit qualitatively different features to those found in 3D. This is evident in the normalized density equation of state, which peaks at intermediate densities corresponding to the crossover from classical to quantum behaviour.